268 



of the Kankakee system, including Upper Fish Lake, Lake of the Woods 

 (Marshall Co.) Pretty Lake, Twin Lakes, Bass Lake and Cedar Lake. 

 Some of the Yellow River Anodontas were normal, oval shells such as 

 are common in the rivers of Northern Indiana; a few were exceptionally 

 thin and exceedingly inflated, resembling A. corjmlenta. Those of 

 Upper Fish Lake — originally a fluviatile lake containing other fluviatile 

 shells such as Q. undulata — were large shells like those of Tippecanoe 

 Lake. The Anodontas of each of the other lakes differed more or less 

 from those of the others, though all probably had a common origin. The 

 only lake of this group the Anodontas of which closely resembled thoso 

 of Lake Maxinkuckee is Bass Lake, and even there the shells were some- 

 what different, being smaller and with the epidermis more deeply stained. 

 Even the Anodontas of Lost Lake differ slightly from those of Lake 

 Maxinkuckee, being somewhat more inflated and with the epidermis 

 green rather than brown, and in having the shell usually somewhat 

 thinner. Some of the shells near the outlet of Lost Lake are exceed- 

 ingly thin, some of them so much so that ordinary print can easily be 

 read through them; they are so fragile that it is almost impossible to 

 keep them. 



Of the collection from Lake Maxinkuckee, mostly from Long Point, 

 26 examples were carefully compaied. The smallest measured 68 mm. 

 long, 38 mm. high and 24.6 mm. in diameter, and the largest 93.5 mm. 

 long, 50 mm. high and 37 mm. in diameter. Among variant foi-ms was 

 one female, gravid when collected, which was unusually elongate, its 

 measurements being 86 mm. long, 43.5 mm. high and 32.5 mm. in 

 diameter. In outline this shell closely resembled Anodontoides feru.s- 

 sacianuH aabcylindraceiis. 



Some of the larger specimens are rather humped and aicuate, the 

 ventral margin of one being somewhat concave. This is a variatio)i 

 which is quite likely to occur in old shells of any species. 



Although gravid Anodontas were found rather frequently during 

 the late autumn, no infected fishes were seen, and no young were found. 



The Anodontas of the lake are fairly free from parasites, a few 

 Atax and Cotylasjns and occasionally a few distomids on the mantle 

 next to the umbonal cavity being the only ones present in any numbers. 

 In some of the other lakes the Anodontas were very badly infested; a 

 colony found in one of the Twin Lakes being infested to a remarkable 



